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This is a USB2.0 data extension cable board, which can amplify USB data signals. If the ordinary USB cable is too long, the signal will be attenuated. You can amplify the signal through this board to send and receive data remotely.
1 board can extend the signal by 10 meters, 20 meters requires 2 boards in series, 30 meters requires 3 boards in series, and the maximum serial connection of 3 boards is extended by 30 meters.
[Scope of use] mobile phones, USB mice, keyboards, MP3, MP4, U disks, hard drives, handwriting boards, printers, scanners, game controllers and other USB devices, support desktops and laptops.

MAX7219 is an integrated serial input/output common-cathode display driver. It connects a microprocessor and an 8-digit 7-segment digital LED display. It can also be connected to a bar graph display or 64 independent LEDs. It includes an on-chip B-type BCD encoder, multiple scan loops, segment word drivers, and an 8*8 static RAM to store each data. There is only one external register used to set the segment current of each LED.
A convenient four-wire serial interface can be connected to all general-purpose microprocessors. Each data can be addressed without rewriting all the displays when updating. MAX7219 also allows users to select encoding or not encoding for each data.
The entire device includes a 150μA low-power shutdown mode, analog, and digital brightness control, a scan limit register allowing users to display 1-8 bits of data, and a detection mode that allows all LEDs to emit light.
Only 3 IO ports can drive 1 dot matrix! No flicker during dot matrix display! Support cascading!
Module parameters:
1. A single module can drive an 8*8 common cathode matrix
2. Module working voltage: 5V
3. Module size: length 6.5 cm X width 3.2 cm X height 1.3 cm
4. With 8 fixing screw holes, the hole diameter is 3mm
5. Module with input and output interface, support multiple module cascade
Wiring instructions:
1. The left side of the module is the input port, and the right side is the output port.
2. When controlling a single module, you only need to connect the input port to the CPU
3. When multiple modules are cascaded, the input terminal of the first module is connected to the CPU, the output terminal is connected to the input terminal of the second module, the output terminal of the second module is connected to the input terminal of the third module, and so on. ..
Take 51 single-chip microcomputers as an example:
VCC → 5V
GND → GND
DIN → P2.2
CS → P2.1
CLK → P2.0
Shipping list:
1. MAX7219 dot matrix module 2 in 1 (finished product, with dot matrix, tested)
2.20CM Dupont Line 5P
3. 5P straight and bent pin headers each

Product Features:
Using FT232BL chip, external EEPRON (93C46)
Support Windows 10
Support 3 power supply modes: 5V external power supply; 3.3V external power supply; external power supply (requires 3.3V-5V)
With 3 LEDs: TXD LED, RXD LED, POWER LED
GND, RXD, TXD, 3V3, 5V: lead out by curved pin
Other function PIN: reserved pad CTS, RTS
Instructions for use: (take access to MCU as an example)
GND: Connect to GND
RXD: connect to MCU.TX (signal flow: MCU.TX >> FT232 >> PC.RX)
TXD: Connect to MCU.RX (signal flow: MCU.RX << FT232 << PC.TX)
3V3/5V: output 3.3V or 5V (the module is powered by USB, the jumper must be jumped to 3.3V or 5V)
RTS: Connect to MCU.CTS (signal flow: MCU.CTS << FT232 << PC.RTS)
CTS: connect to MCU.RTS (signal flow: MCU.RTS >> FT232 >> PC.CTS)

BMI160 6-axis inertial motion sensor
BBS:http://forum.mhetlive.com/
Product introduction
The module uses Bosch's new BMI160 6-axis inertial motion sensor in a MEMS sensor package that integrates the top 16-bit 3-axis accelerometer with an ultra-low-power 3-axis gyroscope. The module can output acceleration data (acceleration values detected by the device in the X, Y, and Z directions) and gyroscope data (the speed at which the device rotates around the X, Y, and Z axes). When accelerometers and gyroscopes operate in full-speed mode, typical power consumption is as low as 950μA, which is only 50% or less of the power consumption of similar products on the market.
Designed for smartphones, tablets, and wearable devices, the Bosch BMI160 includes a built-in smart step counter algorithm that reads the number of steps directly through the registers. The built-in 3-axis acceleration and 3-axis gyroscope enable motion detection such as running and fitness. Module built-in LDO power management chip, VIN supports 3.2~6V wide voltage supply, also has a separate 3.3V interface, compatible with Arduino 3.3V and 5V controller direct drive.
Application
1. Walking step 2. Acceleration detection 3. Inclination measurement 4. Display screen switching horizontal/vertical mode
Technical specifications
Working voltage: 3.2V~6V
Current consumption: <1mA
Interface mode: 2.54 pitch pin header
Acceleration optional ruler: ±2g/±4g/±8g/±16g
Gyro optional scale: ±125°/s, ±250°/s, ±500°/s, ±1000°/s, ±2000°/s
Accelerometer zero drift: ±40mg
Gyroscope zero drift: ±10°/s
Programmable frequency: 25/32Hz~1600Hz
6D detection and positioning
16-bit data output
Impact resistance: 10,000 gx 200μs
2 independent programmable interrupt generators
Built-in 1024 byte FIFO
Working temperature: -40 ° C ~ 85 ° C

ADXL345 is a small, slim, low-power three-axis accelerometer,
Acceleration up to±16 g for high-resolution (13-bit) measurement. Number of digital outputs
The data is in 16-bit two-complement format and can be accessed through SPI (3-wire or 4-wire) or I2C digital interface.
ADXL345 is very suitable for mobile device applications. It can be used in tilt detection applications
Measure the static acceleration of gravity, and can also measure dynamic acceleration caused by motion or impact
speed. It has a high resolution (4 mg/LSB) and can measure approximately 0.25°inclination
Angle changes. Use digital output accelerometers such as ADXL345, no need to
Analog-to-digital conversion, which can save system cost and circuit board area.
Product parameter
Name

ADXL345 module (three-axis gravitational acceleration)
Model

GY-291
Use chip

ADXL345
Power supply

3~5v
Communication method

IIC/SPI communication protocol
Measuring range

±2g ~±16g

tem name: HMC5883L module (three-axis magnetic field module)
Model: GY-273
Chips: QMC5883L
Communication: IIC communication protocol
Measuring range: ± 1.3~8 gauss
Specifications:
Power supply:3~5V
Size: 1.8 x 1.3 cm
Net weight:17 g
Package weight:27 g
Color: As shown in the pictures

BBS: http://forum.mhetlive.com/topic/47/mh-et-live-tiny8-16-0mhz
The MH-ET LIVE Tiny88(16.0Mhz) based microcontroller development board similar to the Arduino line, only cheaper, smaller, and a bit less powerful. With the ability to use the familiar Arduino IDE the MH-ET LIVE Tiny88(16.0Mhz) is a great board to jump into electronics, or perfect for when another board is too big or too much. The MH-ET LIVE Tiny88(16.0Mhz) is shipped fully assembled except for the headers included and easy to solder them by yourself.
Specs:
Support for the Arduino IDE 1.0 (OSX/Win/Linux)
1. Power via USB or External Source - 5v or 7-35v (12v or less recommended,
automatic selection)
2. On-board 500ma 5V Regulator
3. Built-in USB
4. 26 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB)
5. 8k Flash Memory (about 6k after bootloader)
6. I2C and SPI
26-PWM (26 pins with Software PWM, only two(D9, D10) with hardware PWM )
8. ADC on 8 pins
9. Power LED and Test/Status LED
10. Size:44.5x18.3x3mm
PinOut:
Installation and test steps of development board based on Arduino:
1. Download the installation package: "Additional Board Manager URL" in "File", "Item" in Arduino IDE
Enter in the box:
https://raw.githubusercontent.com/MHEtLive/arduino-boards-index/master/package_mhetlive_index.json2. Go to the "Tools" menu, and then select the "Boards" submenu-select "Board Manager", and then select "Contribution" from the Type drop-down menu: select the "MH-ET LIVE Boards Board" package, and click "Install" button;
3. The USB driver can also be downloaded in the supporting file, and the connection is as follows:
https://github.com/MHEtLive/MHEtLiveArduino/releases/download/1.0.0/
2.0a4.rar
4. When downloading the program, do not connect the module first, and then plug it in when the prompt to insert the module appears after compilation, and wait for the automatic download to complete;
5. You can choose the example that comes with Arduino IDE: select the development board as MH-ET LIVE Tiny88 in the toolbar, open the program in File>>Example>>Basic>>Blink, and change port 13 in the program to No. 0 Port, compile and download into the tiny88 development board according to the above method, it can be seen that the onboard LED lights flash at the frequency specified by the program.

Features:
1. The onboard MAX485 chip is a low power consumption and limited slew rate transceiver for RS-485 communication
2. The board is connected to 5.08 (mm) spacing 2P terminal, which is convenient for RS-485 communication wiring
3. All the pins of the chip have been led out, which can be controlled and operated by the single-chip microcomputer
4. Working voltage: 5V
5. Board size: 46(mm)x12(mm)

Product description:
Design your own extended, highly custom circuits to dress up your personal PI 2, A , B
Use 0.1inch (2.54mm) prototype solder holes to connect chips, resistors, LEDs, potentiometers, etc.
All the holes imitate the connection of the familiar breadboard, which is very convenient to use.
There are also long lines for the 3V, 5V and ground connections.
It comes with a printed circuit board and a 2x20 gold plated header that mounts on top of your Raspberry Pi (like a cute little hat...),
This version doesn't come with an EEPROM, so you don't need to worry about EEPROM address conflicts.
You can use standard 2×20 headers.
This HAT Shields are only compatible with Raspberry Pi A , B or PI 2!
It will not support Raspberry Pi A and Raspberry Pi B.
You can install your own ID: EEPROM, official foundation tutorial: https://github.com/raspberrypi/hats
Packing list:
1 HAT perforated board 1
2 2*20 high-end female header 1
3 screws 4 nuts 4 copper posts 4
Size: 66mm*56mm

PDS-9960 gesture recognition / motion direction recognition module
The APDS-9960 is an ambient light sensor with integrated ALS, infrared LED and proximity detectors, and ambient brightness sensing (ALS, Ambient Light Sensing). It uses a dual photodiode to approximate 0.01 lux illumination to approximate the visual response of the human eye. Programmable interrupt function with upper and lower thresholds, up to 16-bit resolution for high flexibility even after dark glass, proximity sensor fully calibrated for 100 mm object detection, eliminating terminal and sub-components Factory calibration requirements. The ambient light dynamic range has also increased from the previous 10K lux to 30K lux, and the solar calibration has been greatly increased to 50K lux, which greatly improves the sensitivity and avoids strong light interference. It can work accurately under the large 1.0mm Air Gap without external isolation processing, which greatly facilitates the customer\'s structural design. Its wait state power consumption - 90μA typical, sleep mode power - 2.2μA typical, more energy efficient; up to 400kHz (I2C fast mode) dedicated interrupt pin, I2C interface compatible, fully integrated solution, convenient structure, and circuit design, I believe that can bring users a better design experience and product value!
Built-in APDS-9960 sensor for ambient light and color measurement, proximity detection, and non-contact gesture detection. With this RGB and gesture sensor, you can control a computer, a microcontroller, a robot, and it\'s much more powerful than your hand with a simple swipe! In fact, the gesture sensor APDS-9960 was used in the Samsung Galaxy S5.
It can be applied to ambient light and RGB color sensing, proximity detection, and gesture detection.
With four infrared sensors, you can measure the light reflectance of each basic position over time and convert those changes into gestures. Our interface library can detect directional gestures (left to right, right to left, top to bottom, bottom to top), but theoretically more complex gestures such as zigzag, clockwise, or counterclockwise, near To the far distance is achievable.
Product parameters:
Working voltage: 2.4V-3.6V
Measuring range: 4-8in (10-20CM)
Interface type: I2C interface
Pin description:
INT: interrupt output
SCL: I2C clock port
SDA: I2C data port
VCC: power supply positive input port, connect 2.4V-3.6V voltage (3.3V recommended)
GND: power supply negative input
VL: External IR LED power supply. Must be 3.0 - 4.5V

STM32F401CEU6 core board V3.0
Freq.84MhzROM:64KB RAM:256KB
STM32F411CEU6core board V3.0
Freq.100MHZ  ROM:128KB RAM:512KB
Core Board Information
Baidu network disk is not recommended to download data, domestic code cloud is fast
Gitee code cloud information link: https://gitee.com/WeAct-TC/MiniF4-STM32F4x1.git
Github information link: https://github.com/WeActTC/MiniF4-STM32F4x1.git
Baidu network disk link: https://pan.baidu.com/s/1vW9H-q9C5n2yVAEp38pw5A
Extract code: gxnx
STM32 download and burn part of the tutorial: https://www.weact-tc.cn/2019/11/30/STM32Download/
Part of MicroPython tutorial: https://www.weact-tc.cn/2020/01/01/micropython/
MicroPython compilation information: https://github.com/WeActTC/WeAct_F411CE.git
25MHZ high speed crystal oscillator & 32.768Khz 6PF low speed crystal oscillator
V3.0 version began to use lead-free process, the pin header is gold-plated pin header, more environmentally friendly
Flash pads have been reserved and USBDisk && FATFFS routines are provided
WeAct HID FW Bootloader has been burned out of the factory. It is a special factory test version, and hex is not provided.
Support MicroPython programming, provide available MicroPython firmware, see the link for configuration files, but do not provide technical answers!
Support Arduino programming, see Github https://github.com/stm32duino/Arduino_Core_STM32 for details
Boards with version V1.3 and above have 3 buttons, reset button, BOOT0 button, and user buttons.
How to enter ISP mode
Method 1: Press and hold the BOOT0 button and the reset button under the power-on state, then release the reset button, and release the BOOT0 button after 0.5 seconds
Method 2: Hold down the BOOT0 key when power is off, and release the BOOT0 key 0.5S after power on
DFU mode: just use the data cable to connect to the computer, if there is a problem of unrecognized, you can properly heat the chip (25 ° C), and then re-enter the ISP mode
Serial port mode: use USB to serial port to connect PA9 and PA10 of the core board
Software: STM32CubeProg.
WeAct HID FW Bootloader
No need for USB to serial port, no debugger, no computer driver, just a TYPE-C data cable to complete the firmware download
For details, see Code Cloud / Soft / WeAct HID FW Bootloader /
How to enter HID Bootloader after writing to APP
Press and hold theKEY button, click thereset button, LED C13flashes, release theKEY buttonto enter

STM32F401CEU6 core board V3.0
Freq.84MhzROM:64KB RAM:256KB
STM32F411CEU6core board V3.0
Freq.100MHZ  ROM:128KB RAM:512KB
Core Board Information
Baidu network disk is not recommended to download data, domestic code cloud is fast
Gitee code cloud information link: https://gitee.com/WeAct-TC/MiniF4-STM32F4x1.git
Github information link: https://github.com/WeActTC/MiniF4-STM32F4x1.git
Baidu network disk link: https://pan.baidu.com/s/1vW9H-q9C5n2yVAEp38pw5A
Extract code: gxnx
STM32 download and burn part of the tutorial: https://www.weact-tc.cn/2019/11/30/STM32Download/
Part of MicroPython tutorial: https://www.weact-tc.cn/2020/01/01/micropython/
MicroPython compilation information: https://github.com/WeActTC/WeAct_F411CE.git
25MHZ high speed crystal oscillator & 32.768Khz 6PF low speed crystal oscillator
V3.0 version began to use lead-free process, the pin header is gold-plated pin header, more environmentally friendly
Flash pads have been reserved and USBDisk && FATFFS routines are provided
WeAct HID FW Bootloader has been burned out of the factory. It is a special factory test version, and hex is not provided.
Support MicroPython programming, provide available MicroPython firmware, see the link for configuration files, but do not provide technical answers!
Support Arduino programming, see Github https://github.com/stm32duino/Arduino_Core_STM32 for details
Boards with version V1.3 and above have 3 buttons, reset button, BOOT0 button, and user buttons.
How to enter ISP mode
Method 1: Press and hold the BOOT0 button and the reset button under the power-on state, then release the reset button, and release the BOOT0 button after 0.5 seconds
Method 2: Hold down the BOOT0 key when power is off, and release the BOOT0 key 0.5S after power on
DFU mode: just use the data cable to connect to the computer, if there is a problem of unrecognized, you can properly heat the chip (25 ° C), and then re-enter the ISP mode
Serial port mode: use USB to serial port to connect PA9 and PA10 of the core board
Software: STM32CubeProg.
WeAct HID FW Bootloader
No need for USB to serial port, no debugger, no computer driver, just a TYPE-C data cable to complete the firmware download
For details, see Code Cloud / Soft / WeAct HID FW Bootloader /
How to enter HID Bootloader after writing to APP
Press and hold theKEY button, click thereset button, LED C13flashes, release theKEY buttonto enter

Product parameter
Operating Voltage

DC12V
Working current

<20MA
Operating frequency range

20Hz~400Hz
Output method

Switch signal output
Maximum detection wire diameter

5.2 mm
Mounting holes

The hole diameter is 3 mm and the hole distance is52.5 mm
working environment

-40℃~ 85℃,0~95％RH
Instructions for use
VCC: working electricity positive
GND: working voltage negative
ON: Normally open, NO and COM are disconnected before the relay is switched on, and shorted after being switched on
COM: common terminal, relay common interface
NC: Normally closed terminal, NC and COM are shorted before the relay is closed, and it is disconnected after being closed

Technical Parameters:
Chip: MAX3232CSE
Voltage range: 3V~5V
Baud rate: It is recommended not to be higher than 120kbps
Size: 9.4mm*15.9mm
Pad pitch: 2.54mm

USB
to Serial Breakout for the FT232RL, a small board with a built in USB
to serial UART interface. This little breakout is built around the
FT232RL IC from FTDI, with an internal oscillator, EEPROM, and a 28-pin
SSOP package this is a serious little chip.
With
this version, we’ve corrected a few issues found with the board. These
changes include fixes to the VCCIO, a change from the mini USB to micro
USB connector, and a few footprint modifications. Other than finding
this board much easier to use, it is still the same FT232RL breakout
that you know and love!
Features:
Implements full v2.0 USB protocol
 
Needs no external crystal
 
Internal EEPROM for device ID and Product Description strings
 
Royalty-Free Driver support for Windows, Linux, and Mac OSX

AHT10 high-precision digital temperature and humidity sensor measurement module
AHT10, a new generation of temperature and humidity sensor, has established a new standard in terms of size and intelligence: it is embedded in a dual-row flat leadless SMD package suitable for reflow soldering, with a bottom surface of 4 x 5mm and a height of 1.6mm. The sensor outputs a calibrated digital signal in a standard I 2C format. AHT10 is equipped with a newly designed ASIC dedicated chip, an improved MEMS semiconductor capacitive humidity sensor element, and a standard on-chip temperature sensor element. Its performance has been greatly improved or even exceeded the reliability level of the previous generation of sensors. A generation of temperature and humidity sensors has been improved to make their performance in harsh environments more stable.
Characteristic:
1. Module size: 16*11 mm
2. Interface type: I2C
3. Working voltage: 1.8-6.0 V
4. Interface size: 4*2.54mm pitch
5. Humidity accuracy: typical ±2%
6. Humidity resolution: 0.024%
7. Temperature accuracy: typical ±0.3℃
8. Temperature resolution: 0.01℃ typical
9. Working temperature: -40℃~85℃

Pin description
SHT40 sensor with shell:
1. VDD power supply 3.3～5.5V DC
2. GND is grounded, the negative pole of the power supply
3. SCL serial clock, input port
4. SDA serial data, bidirectional port
SHT40 sensor with shell adapter board:
1. VDD power supply 3.3～5.5V DC
2. GND is grounded, the negative pole of the power supply
3. SDA serial data, bidirectional port
4. SCL serial clock, input port
Technical Parameters:
1. Humidity measurement range: 0~100% RH
2. Humidity measurement accuracy: ±1.8% RH
3. Temperature measurement range: -40~125℃
4. Temperature measurement accuracy: ±0.2℃
5. Working voltage: 3.3~5VDC
6. I2C interface output
Application occasions:
HVAC, dehumidifier, agriculture, cold chain warehousing, testing and inspection equipment, consumer products, automobiles, automatic control, data loggers, weather stations, home appliances, humidity regulators, medical, and other related humidity detection and control.

Pin description
SHT40 sensor with shell:
1. VDD power supply 3.3～5.5V DC
2. GND is grounded, the negative pole of the power supply
3. SCL serial clock, input port
4. SDA serial data, bidirectional port
SHT40 sensor with shell adapter board:
1. VDD power supply 3.3～5.5V DC
2. GND is grounded, the negative pole of the power supply
3. SDA serial data, bidirectional port
4. SCL serial clock, input port
Technical Parameters:
1. Humidity measurement range: 0~100% RH
2. Humidity measurement accuracy: ±1.8% RH
3. Temperature measurement range: -40~125℃
4. Temperature measurement accuracy: ±0.2℃
5. Working voltage: 3.3~5VDC
6. I2C interface output
Application occasions:
HVAC, dehumidifier, agriculture, cold chain warehousing, testing and inspection equipment, consumer products, automobiles, automatic control, data loggers, weather stations, home appliances, humidity regulators, medical, and other related humidity detection and control.

Illustrate:
The ULN2803A device is a 50 V, 500 mA Darlington transistor array. The device consists of eight NPN Darlington pairs, which have a high voltage output and a common cathode clamp diode for switching inductive loads. The collector current rating of each Darlington pair is 500 ma. Darlington pairs can be connected in parallel to increase current capacity. Applications include relay drivers, electric hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers and logic buffers. Each Darlington pair of the ULN2803A device has a series base resistance of 2.7kΩ and can work directly with TTL or 5V CMOS devices.
Features:
500mA rated collector current (single output)
High voltage output: 50 V
Output clamp diode
Input compatible with various logic types

MCP2551 high-speed CAN communication protocol controller bus interface module
CJMCU-2551 is a fault-tolerant high-speed CAN device, which can be used as CAN protocol controller and physical bus interface. MCP2551 can provide differential transceiver capability for CAN protocol controller, it fully complies with ISO-11898 standard, including 24V voltage requirement.
Typically, each node on a CAN system must have a device that converts the digital signals generated by the CAN controller into signals suitable for bus transmission. It also adds buffers between the CAN controller and high voltage spikes on the CAN bus that may be generated by external devices.
Support 1MB/S operating rate.
·Meet the ISO-11898 standard physical layer requirements.
·Suitable for 12V and 24V systems. The slope is externally controlled to reduce RFI.
·Automatic detection of ground faults at the TXD input.
· Power-on reset and voltage event undervoltage protection.
Unpowered nodes or undervoltage will not affect the CAN bus.
· Low current standby operation.
· Up to 112 nodes can be connected.

This is a simplified rectifier and filter module, which is widely used in the rectifier and filter output of small transformers. It is mainly used in electrical appliances that do not have high power requirements. The power indicator is designed on it, which is convenient to know the status of the power supply intuitively when the power is turned on.
AC to DC Power Conversion Module
1N4007 Bridge Rectifier Filter
Input AC voltage [6V-16V] (capacitor is 50V470UF)
Input and output current【1A】
Use frequency range [50-60HZ]
Wire length (9 cm)
PCB size mm [28*13*1.2]
Rectified output voltage [output = input x1.414] [for example: input 12V AC, then output 12x1.414=16.968V, this is the no-load voltage of the calculation result, only for reference, there will be deviations in practice]

Product number

AHT20
Supply voltage

2.0~5.5VDC
Measuring range(humidity)

0~100％RH
Measuring range(temperature)

-40~ 85℃
Humidity accuracy

±2％RH(25℃)
Temperature accuracy

±0.3℃
Resolution

Temperature:0.01℃;Humidity:0.024% RH
Output signal

I2C signal
Pin

Name

Paraphrase
1

VIN

Supply voltage
2

GND

Power ground
3

SCL

Serial clock,bidirectional
4

SDA

Serial data,bidirectional

Features:
 
Wide supply voltage 1.71 V to 3.6 V
Independent IO power supply (1.8V) compatible with power supply voltage
Ultra-low power consumption of ±2g/±4G/±6g/±8G/±16g dynamically selectable full scale
IIC / SPI digital output interface
16-bit data output
Programmable Embedded State Machine
Embedded temperature sensor
Embedded self-test
Embedded First In First Out
10000 g high impact resistance
Package:
1PCS * CJMCU- LIS3DH High-resolution Three-axis Accelerometer Triaxial Accelerometer Module LIS3D

RCWL-0515 Microwave Induction Module
Product description
RCWL-0515 is a microwave sensor module that uses Doppler radar technology to detect the movement of objects. Using 2.7G microwave signal detection, the module has the characteristics of high sensitivity, long sensing distance, strong reliability, large sensing angle and wide supply voltage range.
Microwave induction is a new type of induction mode without dead angle, based on the principle of Doppler radar. Its planar antenna emits electromagnetic waves and receives reflected echoes, which can effectively suppress the interference of high-order harmonics and other clutter; it is highly reliable, safe and convenient.
Compared with infrared products: the microwave switch has a longer sensing distance, a wide angle, no dead zone, can penetrate glass and thin wood, and can penetrate walls of different thicknesses according to different power, and is not affected by environment, temperature, dust, etc., in 37 In the case of degrees, the sensing distance will not be shortened. Widely used in a variety of human body induction lighting and anti-theft alarm and other occasions.
Main features
Working voltage: 3-12V
Working current: 4mA
2.7G operating frequency
Reserved patch and in-line CDS interface
12m typical sensing range
Adjustable sensing distance
Lead-free process
Repetitive trigger time adjustable
Typical application
Corridor lights, induction lights, solar lights
UV disinfection lamp
Human motion sensing

Description:
The development board integrates the ESP8266 18650 battery. A standard LG 3000mah 18650 battery can run for 17 hours.
What is it?
You can call it "WiFi battery". I am going to make it easier to develop ESP8266 ESP8266 project to add 18650 battery.
Why are you doing?
When you do some ESP8266 items you must be hated to add power to power. This miniature board can solve this problem. LG 3000mah 18650 battery can make ESP8266 run for 17 hours or more.
What makes it special?
· With nodemcu.
· 18650 charging system integration.
· Indication LED (green means full of red means · Charging) Charge and work can be done at the same time.
· 1 switch control power supply.
· 1 SMT connector available for sleep mode
· 1 additional LED programmable (with gpio16 [do])
· 0.5a charge current
1A output
· Overcharge protection
· Over discharge protection
· 10 digital pin read / write / interrupt / PWM / I2C / line support (except D0)
· 1 analog input to be careful -.
If the battery is in the wrong direction, the charging chip will be destroyed.
Note:This product does not contain 18650 battery.
Package included:
1*WeMos D1 Esp-Wroom-02 Motherboard Mini-WiFi Nodemcu Module ESP8266 18650 Battery

Product Features:
1. The four MOS tubes realize the two-way conversion of four 3V and 5V levels,
2. The power input has anti-reverse connection protection, integrated 3.3VLDO, and can provide an external current of no more than 150mA
3. With power indicator, it is clear whether it is working or not at a glance
4. It can realize the bidirectional conversion of 3V-5V level of UART, IIC, 1-wire, SPI and other bus signals
This product is a level conversion module, not a power conversion module! ! Must be connected to a 5V power supply to work normally! Don't buy if you don't know!

Product introduction:
Arduino IIC/I2C interface LCD1602 adapter board without LCD screen
There are only 20 IO ports on the Arduino control board. Add some sensors, SD cards, relays and other modules, so the IO ports are not enough. The original 1602 screen needs 7 IO ports to drive. This module we developed can To help you save 5 IO ports, we send arduino function library.
Product parameters:
1. Size: 41.5mm(length)*19mm(width)*15.3mm(height)
2.Weight: 5g
3.PCB color: black
4. Supply voltage: 2.5-6V
5. Support I2C protocol
6. With backlight power control, you can set whether to connect the backlight power through the jumper cap. Plug in the jumper cap to connect the backlight power, unplug the jumper cap to disconnect the backlight power
7. The contrast can be adjusted. Rotate the blue potentiometer to increase clockwise and decrease counterclockwise. The potentiometer is designed on the front, which is convenient for customers to adjust freely anytime and anywhere
8. Modules can be cascaded, up to 8 can be cascaded. Modify the device address by shorting A0/A1/A2.
The default address of the I2C transfer board is 0x27

20W power module with enable port
Dimensions: 49 (length) * 23.4 (width) * 11.4 (height) mm (without potentiometer)
Module parameters
Module nature: non-isolated buck-boost module
Input voltage: 5~32V
Output voltage: continuously adjustable (1.2~35V)
Output current: 1.5A (MAX)
Input current: 4A (MAX)
Output power: natural cooling 20W, plus heat sink 25W (MAX) actual power
Output power = input voltage * 4A * conversion efficiency
Output ripple: input 12V output 24V 0.5A ripple 30MV 20M bandwidth (for reference only)
Operating temperature: Industrial grade (-40°C to 85°C)
(The ambient temperature exceeds 40 degrees, please reduce the power usage, or strengthen the heat dissipation)
Full load temperature rise: 45℃
Working frequency: 220Khz
No-load current: typical 15mA (5V to 12V)
Load Regulation: ±0.5%
Voltage regulation: ±0.5%
Dynamic response speed: 5% 200uS
Enable control port: yes, high level 1.4V~VIN (ON), low level 0~0.8V (OFF), default high level
Short circuit protection: none (please add a fuse or protection circuit to the input)
Input reverse connection protection: none, please cooperate with our reverse connection protection board or connect a diode in series with the input.
Installation method: can be screwed (fixing hole 3 mm), 2 fixing holes
Wiring method: welding, after adding pins, it can be directly welded on the PCB

AS179 RF switch
Product Features
P1DB dB 30 dBm typical @ 3 V
IP3 43 dBm typical @ 3 Vs low insertion loss (0.3 dB at 0.9 GHz)
Low DC power consumption
Applications
Technical index
1. Power supply voltage: directly control the level through the control port
2. Frequency range (300KHZ-3GHZ)
3. Provide PDF schematic diagram

Note: Lithium iron phosphate battery cannot be used for lithium battery protection board, hernia lamp, hand drill battery pack, electric fish machine battery pack, electric bicycle battery pack, children's car battery, power motor above 550, 1W fisheye LED Lamps, please pay attention to customers who purchase the above combination! .
Main functions: overcharge protection, overdischarge protection, short circuit protection, overcurrent protection
Wiring instructions:
B connect to battery positive
B- Connect to the negative pole of the battery
P Battery pack output and input positive
P- Battery pack output and input negative
Precautions:
1. Please pay attention to the use conditions of input and output voltage and load current so that the power consumption in the protection board does not exceed the allowable power consumption of the electrical parameters.
2. The load current should not work for a long time between the upper limit continuous working current and the overcurrent protection current.
3. When the battery is connected, it may not be able to discharge. In this case, the charger can be connected to the normal working state.
4. Although the protection board has built-in anti-static protection circuit, please do not touch the board with your hands when the electric protection board is working, so as to avoid static electricity to damage the protection board.

Product introduction: PAM8403 Mini Class D digital power amplifier board
1. Working voltage: 2.5V-5.5V. Note: The power supply voltage should not exceed 5.5V, and the positive and negative power supply should not be reversed.
2. Speaker configuration: 4-8 ohms, recommended: 4 ohms; speaker power: 2-8W.
3. You can use the 5V power supply of the computer USB port, or use the 5V power supply of the USB port of the mobile phone charger, or use the lithium battery power supply.
4. High efficiency 90% , 4Ω load and 5V power supply conditions, can provide 3W (left channel) 3W (right channel) output power. The efficiency of class A and class B power amplifiers is only about 30% , and class D power amplifiers are highly regarded in today's green trend.
5. Class D power amplifier has extremely high efficiency, will not affect the sound quality due to temperature rise, and does not need to add a heat sink, which takes up a small volume.
application:
LCD TV, monitor
laptop
Portable speaker
Portable DVD player, game console
Cell phone/hands-free phone
2. Precautions for use:
Turn on the speaker first, then turn on the power, otherwise it will easily cause damage to the chip;
Since the digital volume control in the module has a great gain, don't let the audio signal input too large and cause the signal to be cut and limited.

USB to FDD USB to floppy drive USB interface to floppy drive interface U disk changed to floppy disk A disk USB external floppy drive USB connected to emulation floppy drive, that is, one end of the USB is connected to the computer, the other end of the 34-pin data interface and power interface are connected to the old floppy drive or emulation Read data from the computer, used for floppy disk data reading, etc., various DIY tests, etc.!
Features
z High-performance CMOS technology;
z Working voltage: 5.1V;
z Working current: 10mA;
z Working frequency: 12MHz;
z Fully compatible with USB 1.0 specification.
z Use USB full-speed communication, plug and play;
Usage and purpose:
1: A universal USB cable is required.
2: Need a traditional mechanical floppy drive.
3: A 3.5-inch floppy disk with a capacity of 1.44MB or 720KB is required.
Just plug it into the computer via a USB cable. In this way, the floppy disk can be read and written through the computer
The connection method is as follows:

Name: MPU-6050 module (three-axis gyroscope three-axis acceleration)
Use chip: MPU-6050
Power supply: 3-5v (internal low dropout voltage regulator)
Communication method: standard IIC communication protocol
Chip built-in 16bit AD converter, 16-bit data output
Gyroscope range: ±250 500 1000 2000 °/s
Acceleration range: ±2±4±8±16g
Using Immersion Gold PCB, machine welding process to ensure quality
Pin pitch 2.54mm
MPU-6000 is the world's first integrated 6-axis motion processing component. Compared with the multi-component solution, it eliminates the problem of the axis difference when combining the gyroscope and accelerator and reduces a lot of packaging space. MPU-6000 integrates a 3-axis gyroscope, a 3-axis accelerator, and includes a digital motion processor (DMP: Digital Motion Processor) hardware acceleration that can be connected to other brands of accelerators, magnetic sensors, or other sensors through the second I2C port The engine, from the main I2C port in the form of a single data stream, outputs a complete 9-axis fusion calculation technology to the application side
InvenSense's motion processing database can process the complex data of motion sensing, reduce the load of motion processing operations on the operating system, and provide structured APIs for application development.
MPU-6000's angular velocity full-grid sensing range is ±250, ±500, ±1000, and ±2000°/sec (dps), which can accurately track fast and slow motions, and the user-programmable accelerator full-grid sense The measuring range is ±2g, ±4g±8g and ±16g. Product transmission can be through I2C up to 400kHz or SPI up to 20MHz.
MPU-6000 can work under different voltages. The VDD supply voltage is 2.5V±5% , 3.0V±5% or 3.3V±5% , and the logic interface VVDIO power supply is 1.8V±5% . The packaging size of MPU-6000 is 4x4x0.9mm (QFN), which is a revolutionary size in the industry. Other features include a built-in temperature sensor, and an oscillator that only fluctuates by ±1% in the operating environment.
application
Motion sensing game
Augmented reality
Electronic Image Stabilization (EIS: Electronic Image Stabilization)
Optical Image Stabilization (OIS: Optical Image Stabilization)
Pedestrian navigator
"Zero touch" gesture user interface
Posture shortcut
Certification
market
Smart phone
Tablet device
Handheld gaming products
?Snail Fang?
3D remote control
Portable navigation device
feature
Digital output of 6-axis or 9-axis rotation matrix, quaternion, Euler angle format (Euler Angle forma) fusion calculation data.
A 3-axis angular velocity sensor (gyro) with a sensitivity of 131 LSBs/°/sec and a full-scale sensing range of ±250, ±500, ±1000, and ±2000°/sec.
Programmable control, and the program control range is ±2g, ±4g, ±8g and ±16g 3-axis accelerator.
Remove the sensitivity between the accelerator and the gyroscope axis to reduce the influence of the setting and the drift of the sensor.
The digital motion processing (DMP: Digital Motion Processing) engine can reduce the load of complex fusion calculation data, sensor synchronization, and posture sensing.
Motion processing database supports Android, Linux and Windows
The built-in operating time deviation and magnetic sensor calibration calculation technology eliminates the need for customers to perform additional calibration.
Temperature sensor with digital output
Digital input Sync pin supports video electronic image stabilization technology and GPS
Programmable interrupt (interrupt) supports gesture recognition, panning, screen zooming in and out, scrolling, rapid descent interrupt, high-G interrupt, zero motion sensing, touch sensing, and shaking sensing functions.
VDD supply voltage is 2.5V±5% , 3.0V±5% , 3.3V±5% ; VDDIO is 1.8V±5%
Gyro operating current: 5mA, gyroscope standby current: 5A; accelerator operating current: 350A, accelerator power saving mode current: 20A@10Hz
Up to 400kHz fast mode I2C, or up to 20MHz SPI serial host interface (serial host interface)
The built-in frequency generator has only ±1% frequency change in the full temperature range.
Tested by users themselves
10,000 g collision tolerance
Small and thin packaging (4x4x0.9mm QFN) tailored for portable products
Comply with RoHS and environmental standards

Product description:
The HC-SR505 small human body sensor module is an automatic control product based on infrared technology, with high sensitivity, strong reliability, ultra-small size, and ultra-low voltage working mode. It is widely used in all kinds of automatic induction electrical equipment, especially automatic control products powered by dry batteries.
Features:
■ Automatic induction: when a person enters its sensing range, it outputs a high level, and when a person leaves the sensing range, it automatically delays turning off the high level and outputs a low level.
■ Ultra-small size.
■ Repeatable trigger mode: After the sensor outputs a high level, during the delay period, if a human body is active in its sensing range, the output will always remain high, and the delay will be high until the person leaves. Change to low level (the sensor module will automatically extend a delay time period after detecting each activity of the human body, and take the time of the last activity as the starting point of the delay time).
■ Wide operating voltage range: The default operating voltage is DC4.5V-20V.
■ Micro power consumption: Quiescent current <50 microamperes, especially suitable for automatic control products powered by dry batteries.
■ Output high-level signal: It can be easily connected with various circuits.
Application range:
■ Human body induction lamps ■ Human body induction toys
■ Security products ■ Industrial automation control
■ Automatic induction electrical equipment ■ Battery-powered automatic control, etc.
Operating voltage range

DC4.5~20V
Quiescent Current

<60uA
Level output

High3.3V/Low0V
Trigger method

Repeatable trigger(default)
Delay time

Default8S±30%
Circuit board dimensions

10*23 mm
Sensing angle

<100degreeconeangle
Sensing distance

Within3meters
Operating temperature

-20℃~ 80℃
Sensing lens size

Diameter:10 mm(default)

Model: AVRISP/USBasp/STK500 10PIN to 6PIN Standard Conversion Base
Product use: Convert the standard ATMEL ISP10 to the standard ISP6 download mode to program and test the chip.

Product Introduction
USBHUB, that is, a device that can expand one USB interface into multiple (usually 4) and use these interfaces at the same time. Hub is also commonly referred to as a hub, which uses a star topology to connect multiple USB devices. The USB HUB is expanded based on the 4 USB ports provided by the GL850G chip. GL850G has product features such as low power consumption, low temperature, and reduced number of pins, so it is favored by developers. USB HUB can be connected to computer desk lamp, computer fan, M3, U disk, voice recorder, digital camera, etc.
Product parameter
Working voltage: DC5V
USB port: 4 USB expansion ports, which can work at the same time. The output current of each interface can reach 500mA at a single work, which can be used for USB lighting and related USB devices
Drive: free drive, computer automatically recognizes and installs, plug and play
Protection: Built-in current overload short-circuit protection device
Speed: Support USB2.0 speed up to 480Mbps, backward compatible with USB1.1
Support system: Win95/98/Me/2000/XP, Lin2.4 andMac os88.5 or above
Instructions for use
Insert the male connector with USB-M-A or USB in the module into the computer, the system will automatically recognize the driver, and the computer will have a sound to indicate that the insertion is successful. Status The onboard status indicator turns from on to off, and then flashes again, indicating that the module is available for use. Plug the device with the USB-A male head directly into the 4 USB ports of the module extension, and then you can use it. Such as mouse, keyboard, etc.
Precautions
This module is developed based on the USB2.0/1.1 specification. It is fully compatible with USB2.0. Using USB3.0 or higher may damage your device.
Please be cautious when using high-current mobile hard drives. Generally speaking, when the mobile hard disk is powered by USB, the working current is 0.5A-1A. Too much current requires high USB power supply. The USB Hub itself does not have an external power supply. It borrows the 5V power supply from the motherboard USB, so it may cause insufficient power supply and damage the mobile hard disk. And the transmission rate will decrease, which will affect normal use. It is recommended to plug the mobile hard disk directly into the motherboard.

Product Introduction
USBHUB, that is, a device that can expand one USB interface into multiple (usually 4) and use these interfaces at the same time. Hub is also commonly referred to as a hub, which uses a star topology to connect multiple USB devices. The USB HUB is expanded based on the 4 USB ports provided by the GL850G chip. GL850G has product features such as low power consumption, low temperature, and reduced number of pins, so it is favored by developers. USB HUB can be connected to computer desk lamp, computer fan, M3, U disk, voice recorder, digital camera, etc.
Product parameter
Working voltage: DC5V
USB port: 4 USB expansion ports, which can work at the same time. The output current of each interface can reach 500mA at a single work, which can be used for USB lighting and related USB devices
Drive: free drive, computer automatically recognizes and installs, plug and play
Protection: Built-in current overload short-circuit protection device
Speed: Support USB2.0 speed up to 480Mbps, backward compatible with USB1.1
Support system: Win95/98/Me/2000/XP, Lin2.4 andMac os88.5 or above
Instructions for use
Insert the male connector with USB-M-A or USB in the module into the computer, the system will automatically recognize the driver, and the computer will have a sound to indicate that the insertion is successful. Status The onboard status indicator turns from on to off, and then flashes again, indicating that the module is available for use. Plug the device with the USB-A male head directly into the 4 USB ports of the module extension, and then you can use it. Such as mouse, keyboard, etc.
Precautions
This module is developed based on the USB2.0/1.1 specification. It is fully compatible with USB2.0. Using USB3.0 or higher may damage your device.
Please be cautious when using high-current mobile hard drives. Generally speaking, when the mobile hard disk is powered by USB, the working current is 0.5A-1A. Too much current requires high USB power supply. The USB Hub itself does not have an external power supply. It borrows the 5V power supply from the motherboard USB, so it may cause insufficient power supply and damage the mobile hard disk. And the transmission rate will decrease, which will affect normal use. It is recommended to plug the mobile hard disk directly into the motherboard.

Step-down USB charging module that supports multiple fast charging protocols such as Qualcomm QC3.0
Product Features
Input voltage range: 6V-32V
Output voltage: default 5V, automatically adjust between 3-12V after triggering fast charge
Output power: maximum 24W (5V@3.4A, 9V@2.5A, 12V@2A, etc.)
Output voltage cable compensation function
Conversion efficiency: 90% -97%
Support multiple fast charging protocols
Input overvoltage and undervoltage protection
Input overcurrent protection
Output over current, short circuit protection
Whole machine over-temperature protection
Support fast charge protocol
BC1.2, Apple, Samsung agreement
Qualcomm QC2.0 and 3.0
MTK PE1.1/PE2.0
Huawei Quick Charge Agreement AFC
Spreadtrum Quick Charge Agreement SFCP
Applications
Solar panel to mobile phone charging
Car charging transformation
Driving recorder power supply
Home power transformation
Product Size
34*17*9.5mm (excluding the 1mm protruding USB female seat)

NRF24L01 is a single-chip transceiver chip that works in the 2.4-2.5GHz universal ISM frequency band. The wireless transceiver includes: frequency generator enhanced SchockBurstTM mode controller power amplifier crystal amplifier modulator-demodulator output power channel selection and protocol The setting can be set through the SPI interface. Very low current consumption. When working in the transmitting mode, the current consumption is 9.0mA when the transmitting power is 6dBm. The receiving mode is 12.3mA in power-down mode and the current consumption model is lower in standby mode.
The ISM frequency band is open worldwide, and the maximum transmission power is 0dBm, which can be used without a license.
Support six channels of data reception
1. Low working voltage: 1.9～3.6V low voltage working
2. High rate: 2Mbps, because the air transmission time is very short, which greatly reduces the collision phenomenon in wireless transmission (the software sets the air transmission rate of 1Mbps or 2Mbps)
3. Multi-frequency points: 125 frequency points, meeting the needs of multi-point communication and frequency hopping communication
4. Ultra-small: built-in 2.4GHz antenna, small size, 15x29mm (including antenna)
5. Low power consumption: When working in response mode communication, fast air transmission and start-up time greatly reduce current consumption.
Low application cost: NRF24L01 integrates all high-speed signal processing parts related to the RF protocol, such as: automatic retransmission of lost data packets and automatic response signal generation, etc. The SPI interface of NRF24L01 can be connected with the hardware SPI port of the single-chip microcomputer or use the single-chip microcomputer The I/O port is used for simulation, and there is a FIFO inside that can interface with various high- and low-speed microprocessors, which facilitates the use of low-cost single-chip microcomputers.
7. Easy to develop: Because the link layer is fully integrated into the module, it is very easy to develop. Automatic retransmission function, automatic detection, and retransmission of lost data packets, retransmission time, and retransmission times can be controlled by software to automatically store data packets that have not received a response signal. Automatic response function, after receiving valid data, the module automatically sends a response Signal, no need to program separately Carrier detection—fixed frequency detection Built-in hardware CRC error detection and point-to-multipoint communication address control Data packet transmission error counter and carrier detection function can be used for frequency hopping settings. Six receiving channel addresses can be set at the same time, which can be selective Open the receiving channel standard pin Dip2.54MM pitch interface, which is convenient for embedded applications.
Delivery list: 1 NRF24L01 wireless module (tested)

NRF24L01 is a single-chip transceiver chip that works in the 2.4-2.5GHz universal ISM frequency band. The wireless transceiver includes: frequency generator enhanced SchockBurstTM mode controller power amplifier crystal amplifier modulator-demodulator output power channel selection and protocol The setting can be set through the SPI interface. Very low current consumption. When working in the transmitting mode, the current consumption is 9.0mA when the transmitting power is 6dBm. The receiving mode is 12.3mA in power-down mode and the current consumption model is lower in standby mode.
The ISM frequency band is open worldwide, and the maximum transmission power is 0dBm, which can be used without a license.
Support six channels of data reception
1. Low working voltage: 1.9～3.6V low voltage working
2. High rate: 2Mbps, because the air transmission time is very short, which greatly reduces the collision phenomenon in wireless transmission (the software sets the air transmission rate of 1Mbps or 2Mbps)
3. Multi-frequency points: 125 frequency points, meeting the needs of multi-point communication and frequency hopping communication
4. Ultra-small: built-in 2.4GHz antenna, small size, 15x29mm (including antenna)
5. Low power consumption: When working in response mode communication, fast air transmission and start-up time greatly reduce current consumption.
Low application cost: NRF24L01 integrates all high-speed signal processing parts related to the RF protocol, such as: automatic retransmission of lost data packets and automatic response signal generation, etc. The SPI interface of NRF24L01 can be connected with the hardware SPI port of the single-chip microcomputer or use the single-chip microcomputer The I/O port is used for simulation, and there is a FIFO inside that can interface with various high- and low-speed microprocessors, which facilitates the use of low-cost single-chip microcomputers.
7. Easy to develop: Because the link layer is fully integrated into the module, it is very easy to develop. Automatic retransmission function, automatic detection, and retransmission of lost data packets, retransmission time, and retransmission times can be controlled by software to automatically store data packets that have not received a response signal. Automatic response function, after receiving valid data, the module automatically sends a response Signal, no need to program separately Carrier detection—fixed frequency detection Built-in hardware CRC error detection and point-to-multipoint communication address control Data packet transmission error counter and carrier detection function can be used for frequency hopping settings. Six receiving channel addresses can be set at the same time, which can be selective Open the receiving channel standard pin Dip2.54MM pitch interface, which is convenient for embedded applications.
Delivery list: 1 NRF24L01 wireless module (tested)

use:
Light intensity detection, light intensity sensor, smart car light-seeking module
Module features:
1. Use a sensitive photosensitive resistance sensor
2. Comparator output, clean signal, good waveform, strong driving ability, more than 15mA.
3. Equipped with an adjustable potentiometer to adjust the brightness of detection light
4. Working voltage 3.3V-5V
5. Output form: DO digital switch output (0 and 1) and AO analog voltage output
6. Equipped with fixing bolt holes for easy installation
7. Small board PCB size: 3.2cm x 1.4cm
8. Use a wide voltage LM393 comparator
Module instructions
1. The photoresistor module is the most sensitive to ambient light, and is generally used to detect the brightness of the ambient light, trigger the single-chip microcomputer or relay module, etc.;
2. When the module's ambient light brightness does not reach the set threshold, the DO terminal outputs a high level; when the external ambient light brightness exceeds the set threshold, the DO terminal outputs a low level;
3. The DO output terminal can be directly connected with the single-chip microcomputer, and the high and low level can be detected by the single-chip microcomputer, thereby detecting the change of the ambient light brightness;
4. The DO output terminal can directly drive our relay module, which can form a light control switch.
5. The small board analog output AO can be connected to the AD module, and through AD conversion, a more accurate value of the ambient light intensity can be obtained

Ultra-small DC-DC synchronous rectifier step-down module
Application areas:
DC-DC step-down module for airplane model (support 2S~5S polymer lithium battery), DIY mobile power supply, vehicle power supply, communication equipment power supply, various occasions with demanding requirements on volume and weight.
Technical Parameters:
Model Name

MP1484EN(Ultra-small DC-DC synchronous rectifier step-down module)
Module nature

Non-isolated buck
Rectification method

Synchronous rectification
Input voltage

4.75V-23V
Output voltage

1.0V-17V
Output current

Peak3A,longtime1.8A
Conversion efficiency

96% (high)
Operating frequency

340KHz
Output ripple

30mV(when no load)
Hello Elena

±0.5%
Voltage regulation rate

±2.5%
Operating temperature

-40℃~ 85℃
External dimensions

22.3*17.5*4 mm

This module (MicroSD Card Adapter) is a Micro SD card reading and writing module. Through the file system and SPI interface driver, the microcontroller system can read and write files in the MicroSD card. The SD card library that comes with the IDE can complete the initialization and reading and writing of the card
1. Support Micro SD card, Micro SDHC card (high speed card)
2. Onboard level conversion circuit, that is, the interface level can be 5V or 3.3V
3. The power supply is 4.5V~5.5V, and the onboard 3.3V voltage regulator circuit
4. The communication interface is a standard SPI interface
5.4 M2 screw positioning holes for easy installation
Item

Small value

Typical value

Big value

Unit
Power supply voltage VCC

4.5

5

5.5

V
Current

0.2

80

200

mA
Interface level

3.3or5

V
Support card type

Micro SD card(<=2G)，
Micro SDHC card(<=32G)

-
Size

42X24X12

mm
Weight

5

g

WIFI module ESP-01 ESP-01S debugging downloader: the old board can only be debugged but not downloaded. The upgraded version adds a download circuit, which can be debugged and downloaded.
This price does not include the ESP8266 WIFI module, only the conversion board! ! !
This module is only a USB-to-serial module, which is only responsible for converting the USB interface into a serial port suitable for the ESP8266 module. For all the knowledge of WiFi, please check the relevant information of ESP8266 module to use! !
Use:
The main purpose of this adapter board is to facilitate the connection of ESP8266 to the PC through the serial port.
Material characteristics:
1. Using CH340 to serial port chip, stable performance, good compatibility, Windows system basically supports all.
2. The adapter board integrates 1000uF solid capacitors to ensure current supply and will not crash the WIFI module due to power problems.
3. Adopt 3225 SMD crystal oscillator to improve the stability of the serial port, and it is beautiful and tall.